Final Draft 12 and Final Draft 11.0.2 (and later) allow the user to move to a previous revision set. On Mac the command is under Production > Revisions and on Windows it's under Production > Revisions Setup.
After a script is moved to the previous revision set, the highest (most recent) revision set will still be shown on each page. If the highest revision set on a certain page is (for example) Set 4 and the user moves to the previous revision set, Set 3, that page will still show Set 4.
IMPORTANT: Before you move a script to a previous revision set, make a backup copy (File > Save As <>new file name) in case moving to a previous set does not do what you want.
If you have FD11 but do not have 11.0.2, go to Help > Check for Updates and follow the prompts to update Final Draft.
Final Draft 10 / 9 do not have this ability.